Midwest Canvas 18x40 RECT SOLAR COVER 8 MILThe Midwest Canvas 18' x 40' Rectangular Solar Cover is designed to efficiently trap heat, keeping your pool warmer for longer while reducing energy costs. Made with a durable 8 mil thickness, this solar cover helps retain heat while minimizing water evaporation to maintain consistent pool temperatures. The blue and silver design enhances sunlight absorption while providing effective insulation to keep your pool warm throughout the day and night. This